# target_regs_per_interval (/docs/hyperparameters/target-regs-per-interval)

Originally the setpoint of the registration-rate controller: the number of
registrations per
[`adjustment_interval`](/docs/hyperparameters/adjustment-interval) the chain
tried to hit by moving burn and difficulty. On the current chain it survives
as a **hard cap**: an interval may admit at most three times this many
registrations. Root-subnet validators hit it most directly.

## How it works [#how-it-works]

The value lives in `TargetRegistrationsPerInterval` storage (u16, default
**2**, so the cap is 6). Two places enforce the 3× cap:

* `do_root_register` (`pallets/subtensor/src/coinbase/root.rs`) rejects a root
  registration with `TooManyRegistrationsThisInterval` once
  `RegistrationsThisInterval ≥ 3 × target_regs_per_interval`. The counter
  resets on the root subnet's epoch boundary — one "interval" is effectively
  one root tempo, and `adjustment_interval` itself is not consulted.
* `checked_allowed_register` (`pallets/subtensor/src/lib.rs`) applies the same
  3× comparison when reporting whether a non-root subnet accepts
  registrations; on those subnets pricing is done by the continuous burn
  controller ([`burn_increase_mult`](/docs/hyperparameters/burn-increase-mult)
  and [`burn_half_life`](/docs/hyperparameters/burn-half-life)) rather than by
  steering toward this target.

The legacy EMA adjustment that used this value as a setpoint (together with
[`adjustment_alpha`](/docs/hyperparameters/adjustment-alpha)) no longer exists
in the runtime.

The chart below shows the cap in action: attempts pile up over an interval, and
admission stops once the count reaches 3× the target.

<HyperparamRegsCapChart />

## Reading and setting [#reading-and-setting]

```bash
btcli sudo get --netuid 12 --name target_regs_per_interval
```

Root/governance only — `sudo_set_target_registrations_per_interval` in
`pallets/admin-utils/src/lib.rs` requires the root origin (plus the admin
freeze window being open), so subnet owners cannot change it. The value is a
plain integer.

## Related [#related]

* [`adjustment_interval`](/docs/hyperparameters/adjustment-interval) — the
  legacy cadence this target was measured over
* [`adjustment_alpha`](/docs/hyperparameters/adjustment-alpha) — the legacy
  smoothing factor
* [`max_regs_per_block`](/docs/hyperparameters/max-regs-per-block) — the
  per-block admission cap
* [`min_burn`](/docs/hyperparameters/min-burn) /
  [`max_burn`](/docs/hyperparameters/max-burn) — the price bounds of the
  current controller